The new guidance represents a significant step towards minimising carbon dioxide emissions and optimising energy use with improvements of 40%. The aim of TGD Part L is to limit the use of fossil fuel energy and related CO2 emissions arising from the operation of buildings. 

The new TGD Part L replaces the current version on 1st July 2008 except where planning permission has been applied for on or before 30th June 2008 and substantial work has been completed by 1st July 2009.

Key Issues for New Dwellings

Limitation of primary energy use and CO2 emissions, Use of renewable energy technologies, Limitation of heat loss through the building fabric, Building services efficency, Construction quality and commissioning of services, User Information provided   

Key Issues for Existing Dwellings     

Providing resonable levels of fabric insulation, Air-permeability, Heating appliance efficency, Space heating and water supply controls, Insulation of pipes, ducts and vessels, User Information provided                                                                                  

The methodoloy for calculation is the Dwelling Energy Assessment Procedure (DEAP) as published by Sustainable Energy Ireland. It calculates the annual primary energy use (kWh/m2/yr) and the carbon emission rate kg/m2/yr) associated for both the proposed dwelling and the reference dwelling.

To demontrate compliance an acceptable Primary Energy Consumption rate, the calculated Energy Performance Coefficient (EPC) of the proposed dwelling should be no greater than the Maximum Permitted Energy Performance Corfficient (MPEPC). To demonstrate an acceptable Carbon Dioxide Emissions rate, the calculated Carbon Performance Coeffienct (CPC) should be no greater that the Maximum Permitted Carbon Performance Coefficinet (MPCPC).

Where a building contains more than one dwelling the area-weighted average EPC of all the dwellings should not exceed the MPEPC and the area-weighted average CPC of all the dwellings does not exceed the MPCPC.

KORE Insulation range if products can provide compliance solutiosn with respect to a number of criteria under Part L; limitation of primary energy use and CO2 emissions, limitation of heat loss through the building fabric and construction quality and commissioning of services.

At all times aim to provide continuity of insulation and maximum airtightness. Quality installation is the key to long term insulation performance. High performing insulation products will ultimately reduce the demand on space heating requirements.